All Questions
148
questions
0
votes
0
answers
17
views
Update state, object with arrays
I would like to know how I could update this state:
details: {id:{optionA: optionA,
optionB: optionB,
quantity:1
}}
It would be something like this:
details: [{ 1: {optionA: optionA, optionB: optionB, ...
1
vote
1
answer
103
views
c++ private and protected member inheritance
#include <iostream>
using namespace std;
// Base class
class Base {
private:
int a = 10;
public:
void get () {
cout << "Get:" << a << endl;
}
};
...
- 11
0
votes
1
answer
36
views
React State updates only from the second click event
i'm following a React course on udemy, and while doing a project to test my knowledge about state, i got into a bug i can't solve. The project is about coding an application that has three state ...
1
vote
1
answer
54
views
I have a question about the single responsibility principle in state management in Flutter's Riverpod
Suppose you have code that manages bool type values like the following: (Made with Riverpod)
final isPremiumProvider = NotifierProvider<IsPremiumNotifier, bool>(() {
return IsPremiumNotifier();...
- 662
1
vote
1
answer
47
views
How to copy an object function when updating nested state
I have two pie charts that display the ratio of completed tasks for a given period, and a number of medals received for the period. The issue is that the state contains a function that is responsible ...
- 179
1
vote
1
answer
15
views
failed to understand some js object behavior
console.log("hello");
var data = {
data() {
return { count: 0 };
},
plus() {
return ++this.data().count;
},
};
console.log(data.data().count); //0
console....
- 11
-1
votes
2
answers
40
views
Posting array of objects in React is giving me an extra object
I am trying to post an array of objects. They show up in my HTML but when I console.log it always gives me an extra empty object. Which my backend doesn't love.
Here's the code on codesandbox:
https://...
- 11
0
votes
1
answer
43
views
update the state of an object who's values are an array
I'm looking for a way to update a single index of an object's values that are an array while saving the state of the other values. I tried using a spread operator, but I'm getting an error.
const [...
- 74
0
votes
1
answer
43
views
React Js State Updates
Functional Component React
Making a pizza website where you can buy pizza online. On the website, as online shopping websies, there is cart where you can add products.
There is an array which has ...
- 3
0
votes
1
answer
34
views
I have problem when dynamically updating state in useState object
in my useState I have object with bunch of values. I have input and setting it's value to useState[key] dynamically it works. but problem occurs when I want to update values.
when I am calling ...
- 51
0
votes
1
answer
28
views
boolean input to setState from mapped data
I've got this .map to map a list of checkboxes.
I'd like to map the setState as well, and make in sort it dynamically points out the value binded to each column object:
const [activeColumns, ...
- 331
0
votes
2
answers
88
views
JS React: Two Objects, change properties if name matches
i have a problem with Objects in JavaScript (React).
I have two different Objects, which are generated from two different XML-Files. Each Object has the same Names in it but the points and position ...
- 45
0
votes
2
answers
46
views
How to make an object of fix length in local storage
I want to store my radio button values in an object on local storage with index of the object as key of it. What should I do to make fix size array? Also I want to set that object as initial value of ...
0
votes
2
answers
99
views
setState not triggering re-render in React
Full component:
const Column = ({ form, setForm, fieldset, blocks, selectedFieldsetId, setFieldBeingEdited }) => {
//Sends block being edited to App component
const editField = (e) => {
...
0
votes
0
answers
87
views
How to append value to a state object?
I am creating a Polls application in React, where you can ask a question, set some answers, and let people vote. I am using one state to keep the question, and one state to keep the answers. They are ...
- 1